Combined sand and gravel screen



SCREE AVEL SAND AND GEB. s. 920

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COVIBINED SAND AND GRAVEL SCREEN.

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Specification ef Letters Patent.

Patented Ano'. i, 1322.'

Application filed February 3, 1920. Serial No. 355,936.

T0 all fio/om t may concern.'

Be' it knownv that l, ORLANDO C. CRAN- DALL, citizen of theUnited States, residing at Stanwood, in the county of tiecosta and State of Michigan, have invented certain new vand useful Improvements in Combined Sand and Gravel Screens, of which the following is a speciiication.

This invention relates to a combined stone and sand screen and has as its principal object to provide a device of this character, which may be employed for screening sand or for screening `gravel if the' sand screen is covered.

A further object of the invention is to provide a device employing a framehaving at one end a reticulate sand screen and at its opposite end a gravel grating, the frame being supported in an inclined positionso thatl in the use of the device, sand may be thrown-toward the upper end of the fra-me to flow down over the sand screen while, by covering the; sand screen, gravel also be tossed toward the upper end ofthe frame to roll down over the gravel grating.

rind the invention has as a still further object to provide a device wherein the inclination of the screen frame may be readily varied or adjusted.

Other and incidental objects will appear hereinafter.

In the drawings Figure 1 is a perspective view showing my improved screen in position upon a conventional type of gravel box, the latter beino' shown in dotted lines y h 7 Figure 2 is a longitudinal sectional view taken medially through the device, and

Figure 3 is a fragmentary transverse section taken through the cross bar of the gravel. Igrating of the device.

in carrying the invention into effect, l employ an oblong screen frame having parallel side bars 10 connected by parallel end bars which have been indicated at 11 vand 12 respectively. The upper end bar is arranged with its width disposed vertically, while the lower end bar is arranged with its width disposed horizontally, this latter end bar being secured to the lower edges of the side bars. Extending between the side bars in spaced relation to the upper end bar is a cross bar 13 lying parallel to the bar 11, and midway between the bars 12 and 13 is another cross bar 14 lying parallel to the bar 13. The several bars of the frame may be secured together in any approved mannerand in this connection it will be observed that the bars 12, 13 and 11i are all lying flat and mortised into the lower edges of the side bars so as to lie fiush with the bottom edgevof the end bar 11. A recticulate sand screen is suspended between the bars 11 and 13 and the side bars 10. This screen'may be formed of any approved material and, bracing the screen, are spaced brace rods 16` extending longitudinally ofthe frame between the bars 11 vand 13. Y These brace rods may be connected at their ends to the cross bars in any approved manner and are designed to prevent sagging of the intermediate portion of the screen. Seated upon the upper edges of the side bars 10 and the upper endfbar 11 are side boards 17 extending about three of the sides of the screen 15 and providing, in effect, a hopper therefor, the longitudinal side walls terminating at their lower ends in a plane with the lower edge of the cross vSecured at one'edgefof this cross` bar Y13. bar is a rearwardly inc-lined sand apron 18 of a width corresponding to the width of the bars 10. f

Extending longitudinally between the bars 12 and 13 are transversely spaced parf allel grating rods 19 forming a gravel grating in continuation of the screen 15 at the lower end portion of the frame. These rods are supported at their intermediate portions by the cross bar 1li, and the bars 12 and 13 are provided in their upper faces with alined sockets, while the bar 14 has in its upper face grooves each alining with the corresponding` sockets. The rods 19 are each engaged at their end portions in these frame and fastenedat its ends to the side sockets, while the intermediate portion of each of said rods is received within the alining `groove of the bar 14. The rods will thus be securely held against lateral move# ment Vwith respect to each other and engaged through the end portions of the rods as well as through the intermediate portions thereof are suitable fastening devices firmly securing-the rods to the bars.

Fixed to the lower end portions of the sidev bars 10 of the frame are short legs 2O eX- tending from the bars at substantially right angles and pivoted to the upper end portions of said side bars are long legs 21 for supporting the frame. Adjacent their lower ends, the legs 21 carry brackets 22 adjustable longitudinally'of the legs and projectscreening gravel, thel screen V may be ing rearwardly therefrom. As will b e readily understoodthelegs 20 and 21 are adapt ed to support the screen trainein inclined position, the legs 2l being swingingly adjustable for vvarying the inclination oit the iframe. However in the drawings l have shown the device rin connection with a conventional type oi' gravel box 23, in order to bring J out the manner in which the device may be'used ini connection with such. a box. A -s shown, the short legs 2O o the `frame are placed1 against the inner side of one side wall et 'the boxl so that the lowerend portion of the 'frame projects over said side wall. This done, the brackets 22 on the legs 2l are placed-overthe upper edge ot the other side wall of theabox so that the lower Vend portions of the legs- Ql project-at the rllhus the outer side ot thislattei side wall. legs will support the screen upon: the box, and, as will be readily understood, the brackets-.may be adjustably positioned along the legs 21 'for varying the inclination oty the j screen.' Sand may then be thrown upon the screen 1.5 when the screen will serve to separate stones and gravel 'from lthe sand, the

latter Vflowing through the screen `onto the apron-l8` kand directed thereby to one side of the gravel box and` they gravel rolling 1 downwardly over the screen to vtall through the gravel gratinginto the box,I the stones allingover the lower end ofthe frame. For

suitably covered. This done, gravel may thenbe thrown upon the cover to roll down over the gravel grating, the gravel falling through the grating into the gravel box and any stone in the gravel being separated therefrom to be directed by the grating to the forward side ci' the boX. Y. Y

lDivoted upon the lower-'end portions of the side bars l0 is a stop member 24; normally projecting beyond the lower endI of the screen and designed' to prevent stones, rolling 'from the gravel grating, to strike a workman standing adj acent, thel screen. vAs

shown in Figure 2, the stop meinber'Qa 'may be folded upwardly to lieV between the side.y

bars. llt will accordingly be seen that l.. provide a device which may be readily ein` ployed r'or screening either sand or gravel and, when used in connection with a gravel box, vgravel will bey discharged into the box,

vwhileY sand'will be discharged at one side and stonefat the other sideofthe box.

Having thus described the invention, what is claimed as'new is:

A. .screening `.device comprising a frame having a screening surface, stationary legs at vthe lower end of the trame for supporting the same, vlegs pivoted to the upper portion ot the traine at the opposite sides thereof and swingingly adjustable with relation thereto, and support clamping members longitudinally slidavbly adjustable vupon the lower ends of said last-inentionedlegs,v and hook-engaging members carried by said support clamping members and projecting atan angle to the respective legs. l p l In testimony whereof I affix my signature.

`oiuilrfnno o.l @RANDALL [n s] 

